# How can i do a matrix like this one?

I was asked to type these matrices as they appear, but I don't know how to do that. (I highlighted the problem in red)

I tried so far this:

$A= \begin{pmatrix} -4 & 2 & 12 \\ 2 & -6 & 9 \\ 8 & 7 & -2 \end{pmatrix}$ \hspace{1.1cm} $A= \begin{pmatrix} 13 & -21 & 9 & 12\\ -9 & 2 & -8 & -7 \\ 9 & -2 & 1 & 7 \end{pmatrix}$ \hspace{1.5cm} $A= \begin{pmatrix} 12 & 11 \\ 11 & 22 \\ 8 & 12 \end{pmatrix}$\\
$A= \begin{pmatrix} 12 & 12 & -2 \\ 2 & 6 & -9 \\ \end{pmatrix}$ \hspace{1.3cm} $A= \begin{pmatrix} -3 & 2 & 8 & 7\\ -4 & 2 & 8 & -7 \\ 2 & -12 & 11 & 32 \\ 1 & 5 & -21 & -12 \\ 12 & -11 & 6 & 76 \\ 11 & 12 & -11 & -29 \\ \end{pmatrix}$ \hspace{1.1cm} $A= \begin{pmatrix} 12 & 7 & 2 & 12 \\ 7 & -4 & 2 & -6 \\ 7 & -9 & 12 & -8 \end{pmatrix}$\\
$A= \begin{pmatrix} 11 & 9 & 13 \\ 12 & -2 & 21 \\ \end{pmatrix}$ \hspace{7.3cm}  $A= \begin{pmatrix} -12 & 21 & -34 & -23 \\ 13 & -21 & 15 & 21 \\ -43 & 16 & 32 & -19 \end{pmatrix}$


And this was where I get.

The problem is that I have to type the code exactly as the image, but I don't see how to get that big matrix with that respective spaces.

• You have to add some code, the so-called MWE, and explain your problem clearly if you expect us to help you. How many matrices do you have? How doyou wnt them aligned? etc. Commented Oct 2, 2020 at 13:32
• Welcome to TEX.SE! What have you tried so far? What exactly is the problem? The mutual alignment? Please explain. Commented Oct 2, 2020 at 13:32

It's quite hard to understand what meaning the required alignment would carry.

A three column array with nested one column arrays should do.

\documentclass{article}
\usepackage{amsmath}

\begin{document}

$\begin{array}{@{}l@{\hspace{1cm}}ll@{}} \begin{array}[t]{@{}l@{}} A= \begin{pmatrix} -4 & 2 & 12 \\ 2 & -6 & 9 \\ 8 & 7 & -2 \end{pmatrix} \\ A= \begin{pmatrix} 12 & 12 & -2 \\ 2 & 6 & -9 \\ \end{pmatrix} \\[6ex] A= \begin{pmatrix} 11 & 9 & 13 \\ 12 & -2 & 21 \\ \end{pmatrix} \end{array} & \begin{array}[t]{@{}l@{}} A= \begin{pmatrix} 13 & -21 & 9 & 12\\ -9 & 2 & -8 & -7 \\ 9 & -2 & 1 & 7 \end{pmatrix} \\[6ex] A= \begin{pmatrix} -3 & 2 & 8 & 7\\ -4 & 2 & 8 & -7 \\ 2 & -12 & 11 & 32 \\ 1 & 5 & -21 & -12 \\ 12 & -11 & 6 & 76 \\ 11 & 12 & -11 & -29 \\ \end{pmatrix} \end{array} & \begin{array}[t]{@{}l@{}} \\[-2.5ex] A= \begin{pmatrix} 12 & 11 \\ 11 & 22 \\ 8 & 12 \end{pmatrix} \\[6ex] A= \begin{pmatrix} 12 & 7 & 2 & 12 \\ 7 & -4 & 2 & -6 \\ 7 & -9 & 12 & -8 \end{pmatrix} \\[4.5ex] A= \begin{pmatrix} -12 & 21 & -34 & -23 \\ 13 & -21 & 15 & 21 \\ -43 & 16 & 32 & -19 \end{pmatrix} \end{array} \end{array}$

\end{document}